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Performances of promoted cobalt catalysts supported on mesoporous alumina for Fischer-Tropsch synthesis
Applied Catalysis A: General ( IF 5.5 ) Pub Date : 2017-08-25 , DOI: 10.1016/j.apcata.2017.08.032
Vahid Vosoughi , Ajay K. Dalai , Nicolas Abatzoglou , Yongfeng Hu

Noble metals (Ru, Re, Pt, Ir) and transition metals (Mn, Y) with their atomic ratio of 0.01 to cobalt were used as promoters on the cobalt catalysts supported on mesoporous alumina. The cobalt loading was 15 wt% and all catalysts were tested for Fischer-Tropsch synthesis in a fixed-bed reactor. The process conditions for activity test were: 230 ° C and 400 psi, GHSV = 900 h−1, and H2CO=2.0. The selectivity test for the promoted and unpromoted catalysts was performed at CO conversion ≈50% by adjusting the syngas flowrate. Addition of promoters increased the cobalt dispersion on mesoporous alumina support. The highest increase in dispersion from 4.7% to 7.6% resulted from addition of Ru. Promoters positively impacted the cobalt dispersion in the decreasing order of: Ru < Re < Pt < Ir < Mn < Y. The reduction temperature for all promoted catalysts were shifted to lower temperature. The maximum decrease in temperature happened with platinum by ΔT ∼ − 150°C for the 1st reduction temperature and ΔT ∼ − 270°C for the 2nd reduction temperature. The reducibility of the CoOx species on mesoporous alumina was extensively improved by noble metals addition and modestly enhanced by Mn and Y. Significant increase in CO conversion and C5+ of the promoted catalysts were observed. CO conversion was increased from ∼60% to ∼86, 84, 82, 80% as a result of Ru, Re, Ir, Pt addition. Addition of Ru and Re promoters favored the heavy molecular weight hydrocarbons’ (C5+) selectivity and improved it from 81.7% to 84.2 and 83.1%, respectively.



中文翻译:

费-托合成中介孔氧化铝负载的钴催化剂的性能

原子比与钴的原子比为0.01的贵金属(Ru,Re,Pt,Ir)和过渡金属(Mn,Y)用作负载在介孔氧化铝上的钴催化剂上的促进剂。钴载量为15重量%,并且在固定床反应器中测试所有催化剂的费-托合成。活性测试的工艺条件为:230°C和400 psi,GHSV = 900 h -1,以及H2个CØ=2.0。通过调节合成气流量,在CO转化率≈50%的条件下对促进和未促进催化剂进行了选择性测试。助催化剂的加入增加了钴在中孔氧化铝载体上的分散性。分散液中Ru的添加使分散度从4.7%增至7.6%最高。助剂按以下降序对钴的分散度产生积极影响:Ru <Re <Pt <Ir <Mn <Y。所有助催化剂的还原温度均移至较低温度。在温度最高降幅发生与铂由Δ Ť  〜 - 150℃ Ç用于第一还原温度和Δ Ť  〜 - 270° Ç为第二还原温度。CoO x的还原性贵金属的添加大大改善了介孔氧化铝上的金属形态,而锰和钇则适度地增强了介孔氧化铝上的金属形态。观察到助催化剂的CO转化率和C 5+显着增加。通过添加Ru,Re,Ir,Pt,CO转化率从约60%增至约86、84、82、80%。Ru和Re促进剂的加入有利于重分子量烃的(C 5+)选择性,并将其分别从81.7%提高到84.2%和83.1%。

更新日期:2017-08-25
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